Chemical Engineering - Heat Transfer

1. 

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid

A. varies directly as the area and the LMTD.
B. directly proportional to LMTD and inversely proportional to the area.
C. varies as square of the area.
D. none of these.

Answer: Option A

Explanation:

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2. 

With increase in temperature, the total emissivity of conductors

A. increases
B. decreases
C. remains same
D. decreases linearly

Answer: Option A

Explanation:

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3. 

Loss of heat from untagged steam pipe to the ambient air is by

A. conduction
B. convection
C. radiation
D. all (a), (b) & (c)

Answer: Option D

Explanation:

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4. 

Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.

A. long tube
B. falling film
C. high pressure
D. none of these

Answer: Option B

Explanation:

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5. 

Tubes are held between top and bottom tube sheets in Calenderia type evaporator by keeping

A. both the tube sheets fixed.
B. both the tube sheets floating.
C. the top tube sheet floating and bottom tube sheet fixed.
D. the top tube sheet fixed and the bottom tube-sheet floating.

Answer: Option A

Explanation:

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